Literature Review Example: Samples, Structure, and Sources

A literature review is a structured synthesis of the existing scholarship on a defined research question or topic, used in nursing, public health, psychology, education, business, and STEM disciplines to map what is known, what is contested, and what remains unanswered before a writer reports new research or recommends new practice. Literature reviews coursework support appear as stand-alone assignments in graduate coursework, as required chapters in theses and dissertations, as introductory sections of empirical papers, and as published review articles that synthesize a field for other researchers, with each format sharing the same underlying tasks: identify relevant sources, evaluate their quality, group them by argument or theme, and write a coherent narrative that goes beyond a series of summaries. EssayFount writing experts support undergraduate, graduate, and doctoral writers through every stage of the literature review, including search strategy, source screening, data extraction, synthesis, structure, and disciplined writing that resists the temptation to summarize source by source.

Written by Rohan Mehta, Lead Writing Expert (Health Sciences). Reviewed by Naomi Alvarez, Lead Writing Expert (STEM and Engineering). Last reviewed 2026-04-24.

What a literature review actually does

The phrase "literature review" covers a family of related tasks, not one task. Knowing which version your assignment expects is the first decision. The five most common types differ in scope, search rigor, and analytic depth.

• Narrative review. A flexible, expert synthesis that organizes published work around themes, questions, or controversies. Most undergraduate coursework reviews and many introduction sections of empirical papers are narrative reviews.
• Systematic review. A reproducible synthesis with a registered protocol, defined search strategy, screening at title-abstract and full-text levels, and explicit inclusion criteria. Used widely in health sciences and increasingly in education and policy. Often follows PRISMA reporting guidance.
• Scoping review. A reproducible mapping of the breadth and key concepts of a body of literature when the field is too new or too broad for a systematic review. Follows the JBI or PRISMA-ScR frameworks.
• Integrative review. A synthesis that combines empirical and theoretical literature, common in nursing and applied disciplines, when the goal is to develop a model or framework.
• Theoretical review. A synthesis focused on theoretical or conceptual contributions, used to map how a construct has been defined and operationalized across the literature.

Across all five types, a strong literature review does three things every assignment expects: it answers a defined question, it groups sources by argument rather than by author, and it ends with a clear statement of what remains unresolved.

Literature review structure

The standard literature review structure scales from a 1,500 word coursework assignment to a 30,000 word dissertation chapter without changing shape. The architecture below works across disciplines.

Introduction

• Define the topic, the boundaries of the review, and the question you are addressing.
• State why the review matters now (a gap, a controversy, a policy decision pending, an emerging method).
• Preview the organization of the review (themes, time periods, theoretical lenses) so the reader knows what to expect.

Methods (for systematic, scoping, and integrative reviews)

• Search strategy: databases searched, search terms, date range, language limits.
• Inclusion and exclusion criteria.
• Screening and selection process, often presented in a PRISMA flow diagram.
• Data extraction and quality appraisal procedure.

Body, organized thematically

The body of a literature review groups sources by argument, theme, or theoretical position rather than walking through them one at a time. Within each thematic section, write a topic sentence that states the claim the section will support, then synthesize the evidence from multiple sources, and end with a sentence that links back to the larger question.

Synthesis paragraph or matrix

A strong literature review pauses periodically to synthesize across themes, naming where studies converge, where they conflict, and what those conflicts suggest about underlying methodological or theoretical differences. The synthesis paragraph is what separates a review from a list.

Conclusion and gap statement

The conclusion summarizes what is established, what is contested, and what remains unanswered. A strong gap statement names a specific question the field has not yet answered and points toward what new research could resolve.

Five literature review examples by type

The samples below show opening paragraphs from five different review types on five different topics. Each excerpt models the genre's voice and structural moves.

Example 1: Narrative review (undergraduate education essay)

The role of formative feedback in undergraduate writing courses has been studied across more than three decades of empirical and theoretical work, with consistent attention to how feedback type, timing, and source shape student revision. Early studies framed the question through cognitive models of revision (Sommers, 1980), arguing that feedback supports revision only when students can act on it. More recent scholarship has shifted attention to dialogic models, in which feedback is understood as part of an ongoing conversation rather than as a one-way evaluation (Carless, 2019; Winstone & Boud, 2022). The contrast matters because it changes what counts as effective feedback. Under cognitive models, comments that name a fixable problem are sufficient. Under dialogic models, the comment must also invite a response, signal to the student that revision is expected, and connect to subsequent assessment. This review traces those two traditions across coursework writing in the United States and the United Kingdom and identifies three open questions that remain unresolved across both.

Notice three moves the opening makes. It defines the scope (undergraduate writing, formative feedback). It contrasts two competing frameworks rather than summarizing them in turn. And it previews the gap statement that the rest of the review will return to.

Example 2: Systematic review (nursing health-services research)

Adherence to oral antihyperglycemic therapy among adults with type 2 diabetes is consistently associated with improved glycemic control, yet adherence rates remain below 60 percent across most cohorts (Sapkota et al., 2020). Behavioral and educational interventions to improve adherence have been studied in randomized trials and pragmatic implementation studies, but the comparative effectiveness of intervention components has not been synthesized in the past five years. We conducted a systematic review of randomized controlled trials published between January 2020 and December 2025 that evaluated adherence interventions among adults with type 2 diabetes managed in primary care. The protocol was registered on PROSPERO before screening began (CRD42026XXXXX). Searches were conducted in MEDLINE, CINAHL, Embase, and Cochrane CENTRAL using a combination of MeSH terms and free-text terms for diabetes, adherence, and intervention. Two reviewers screened titles and abstracts independently and resolved disagreements by discussion. Risk of bias was assessed using the Cochrane Risk of Bias 2 tool. The review followed PRISMA 2020 reporting guidelines.

Notice three moves the opening makes. It establishes the clinical importance of the question with a specific statistic. It signals review type by naming a registered protocol and the PRISMA framework. And it telegraphs that this review will be reproducible by listing databases, screening procedures, and risk-of-bias tools.

Example 3: Scoping review (educational technology in K-12)

The use of generative artificial intelligence tools in K-12 classrooms has expanded rapidly since 2023, with adoption outpacing the empirical literature on its effects on student learning, teacher workload, and assessment integrity. The breadth of contexts (elementary writing, middle school mathematics, high school science labs, special education planning) and the heterogeneity of tools and pedagogies have so far precluded a systematic review. We conducted a scoping review using the JBI methodology and the PRISMA-ScR reporting framework to map the existing empirical and grey literature on generative AI in K-12 contexts published between 2023 and 2025. The objective was not to assess the effect of AI tools on outcomes, which existing studies cannot yet support, but to chart the kinds of questions the field has begun to study, the kinds of methods it has used, and the kinds of populations it has reached.

Notice three moves the opening makes. It explains why a systematic review is not yet possible. It states the scoping review's distinct goal (to chart breadth, not to assess effect). And it names the methodological framework (JBI and PRISMA-ScR).

Example 4: Integrative review (psychology of resilience)

Resilience has been theorized as a stable trait, a dynamic process, and a developmental outcome across the past four decades of psychological research, with each framing producing different operational definitions, measurement instruments, and intervention targets. Theoretical reviews have mapped the conceptual landscape but have rarely engaged with the empirical literature that operationalizes the constructs they critique, and empirical reviews have rarely paused to interrogate the conceptual assumptions that shape their measurement choices. This integrative review brings the two literatures into conversation, drawing on theoretical, qualitative, and quantitative studies to develop a working framework that distinguishes between trait-level, process-level, and outcome-level uses of "resilience" and links each to the methods through which the field has studied it.

Notice three moves the opening makes. It identifies three competing framings inside one construct. It explains the gap an integrative review fills (combining theoretical and empirical work). And it names the contribution the review will make (a working framework).

Example 5: Theoretical review (organizational behavior)

Psychological safety has become a central construct in research on team performance, learning, and innovation since Edmondson's (1999) foundational study introduced the term to the organizational behavior literature. The construct has been operationalized in dozens of distinct ways and has been positioned variously as an antecedent, a moderator, a mediator, and an outcome across competing theoretical models. The proliferation of operational definitions has begun to outpace conceptual clarity. This review traces the construct of psychological safety across twenty-five years of theoretical and empirical literature, identifies the four most consequential definitional drifts, and proposes a refined construct definition that distinguishes between climate-level and team-level uses of the term.

Notice three moves the opening makes. It anchors the construct in a foundational study. It identifies the conceptual problem (definitional drift). And it states the contribution (a refined construct definition).

How to write a literature review step by step

1. Define the question. Write the review's research question in one sentence. If the question requires more than one verb, split it into two reviews or narrow the scope.
2. Choose the review type. Match the type to the question, the assignment, and the discipline. Systematic reviews are not always the strongest answer; narrative reviews are appropriate when the goal is to map a contested theoretical landscape rather than to synthesize quantitative effects.
3. Build a search strategy. List the databases (PubMed, Scopus, Web of Science, ERIC, PsycINFO, CINAHL, Business Source Complete, IEEE Xplore, JSTOR), the search terms, and any limits (date, language, study design). Document the strategy as you build it.
4. Run the search and screen. Export results to a reference manager (Zotero, EndNote, or Mendeley). For systematic and scoping reviews, screen titles and abstracts in pairs and resolve disagreements by discussion.
5. Extract data. Build a synthesis matrix (a table with one row per source and columns for the most consequential variables: design, sample, intervention, findings, framework). The matrix is the engine of synthesis.
6. Group sources by argument, not by author. Sort the matrix rows into thematic clusters. Each cluster will become a body section. Sources may appear in more than one section.
7. Outline the body. Draft a topic sentence for each thematic section that states the claim the section will support. Confirm the topic sentences make a coherent argument when read in sequence.
8. Draft the body before the introduction. Drafting the body first forces clarity about what the review actually argues. The introduction can then frame what the review found, not what the writer predicted.
9. Synthesize across sections. Add at least one synthesis paragraph that names where the literature converges and where it conflicts. This paragraph is the difference between a review and a list.
10. Write the gap statement. The conclusion must end with a specific question the field has not yet answered. A vague gap statement weakens an otherwise strong review.
11. Cite as you draft. Add citations the moment you use a source. Backfilling is the largest cause of citation errors in literature reviews.
12. Revise for synthesis voice. On revision, ask whether each paragraph synthesizes across sources or just summarizes one source. Convert summary paragraphs into synthesis paragraphs.

Search strategy and source quality

The strength of a literature review is built before any sentence is drafted. The search strategy and source quality decisions determine whether the writer is reviewing the right body of work in the first place.

• Use discipline-appropriate databases. PubMed and CINAHL for health sciences, PsycINFO for psychology, ERIC for education, Web of Science and Scopus for cross-disciplinary searches, IEEE Xplore for engineering and computer science, Business Source Complete for management and finance.
• Combine controlled vocabulary with free-text terms. Database thesauri (MeSH, Emtree) capture concepts that authors phrase in many ways. Combine MeSH or thesaurus terms with free-text synonyms.
• Document inclusion and exclusion criteria before screening. Defining criteria after seeing results introduces selection bias.
• Track grey literature when relevant. Conference proceedings, theses, government reports, and preprints belong in many reviews, especially in fast-moving fields.
• Apply quality appraisal tools when warranted. Cochrane RoB 2 for randomized trials, ROBINS-I for non-randomized studies, JBI tools for qualitative and mixed-methods studies, AMSTAR-2 for reviews of reviews.
• Update the search before submission. Long review timelines mean the search becomes outdated. Re-run the search within three months of submission.

The synthesis matrix

The synthesis matrix is the most useful tool in literature review writing. It lets the writer compare studies across consequential variables in one view and surfaces patterns that would be invisible in a list of summaries. A typical matrix has one row per source and the following columns:

• Author and year
• Country or setting
• Study design
• Sample size and characteristics
• Intervention or exposure
• Comparator (if applicable)
• Outcomes measured
• Theoretical framework
• Key findings
• Limitations noted by authors
• Notes for synthesis (your own observations)

Build the matrix in a spreadsheet so it is sortable. The act of sorting by intervention type, by setting, or by study design produces the thematic clusters that become body sections.

Common literature review mistakes

• Annotated-bibliography syndrome. One paragraph per source with no synthesis. The most common reason graduate-level reviews lose marks.
• Drifting research question. Reviews that begin with one question and end with another read as unfocused. Lock the question before drafting.
• Citing only abstract-level claims. Citing studies on the basis of their abstracts alone is a citation error and surfaces as inconsistencies between in-text claims and actual findings.
• Mistaking recency for quality. A 2024 study is not stronger than a 2018 study by virtue of date. Quality follows from design, sample, and method.
• Ignoring conflicting evidence. Reviews that present only supportive evidence are unbalanced. Acknowledge and explain conflicts.
• Inconsistent terminology. Switching between "psychological safety" and "team safety" without naming the difference confuses the reader.
• Missing methods section. Systematic and scoping reviews lose credibility without a transparent methods section.
• No clear gap statement. A review without a specific gap statement leaves the reader without a takeaway.
• Citation density problems. Paragraphs with one citation per claim look thin; paragraphs with seven citations per sentence look performative. Match citation density to the claim's specificity.
• Not updating before submission. Long review timelines invite missed recent studies. Re-run the search.
• Theoretical-empirical mismatch. Citing a study to support a claim it does not actually make is the most damaging credibility loss in a review.
• Ignoring methodological diversity. Treating qualitative, mixed-methods, and quantitative studies as interchangeable evidence reduces the review's analytic value.

How EssayFount supports literature review writing

Literature reviews are the writing assignment graduate students most often request help on, because the volume of source work, the breadth of synthesis, and the discipline-specific conventions stack on top of each other. EssayFount writing experts work with undergraduate, master's, and doctoral writers across nursing, public health, psychology, education, business, and STEM fields. We help with research-question definition, search strategy design, screening and data extraction support, synthesis matrix construction, structural outlining by theme rather than by author, drafting of synthesis paragraphs, gap-statement sharpening, and end-to-end editing for citation accuracy and voice. We support narrative, systematic, scoping, integrative, and theoretical review formats and can align reviews with PRISMA, JBI, AMSTAR-2, and the conventions of the writer's specific journal or program.